/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.io.synthetic;



import com.bff.gaia.unified.sdk.coders.AtomicCoder;

import com.bff.gaia.unified.sdk.coders.BigEndianLongCoder;

import com.bff.gaia.unified.sdk.coders.Coder;

import com.bff.gaia.unified.sdk.io.UnboundedSource;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;



/**

 * Holds enough state to resume generating synthetic records back from where it was checkpointed.

 */

class SyntheticRecordsCheckpoint implements UnboundedSource.CheckpointMark {

  private static final Coder<Long> LONG_CODER = BigEndianLongCoder.of();



  /** Coder for this class. */

  public static final Coder<SyntheticRecordsCheckpoint> CODER =

      new AtomicCoder<SyntheticRecordsCheckpoint>() {



        @Override

        public void encode(SyntheticRecordsCheckpoint value, OutputStream outStream)

            throws IOException {

          LONG_CODER.encode(value.startPosition, outStream);

          LONG_CODER.encode(value.endPosition, outStream);

        }



        @Override

        public SyntheticRecordsCheckpoint decode(InputStream inStream) throws IOException {

          long startPosition = LONG_CODER.decode(inStream);

          long endPosition = LONG_CODER.decode(inStream);



          return new SyntheticRecordsCheckpoint(startPosition, endPosition);

        }

      };



  private final long startPosition;



  private final long endPosition;



  public SyntheticRecordsCheckpoint(long startPosition, long endPosition) {

    this.startPosition = startPosition;

    this.endPosition = endPosition;

  }



  @Override

  public void finalizeCheckpoint() {

    // Nothing to finalize.

  }



  public long getStartPosition() {

    return startPosition;

  }



  public long getEndPosition() {

    return endPosition;

  }

}